These photos that just popped up on Planet-9 apparently show what is believed to be a 981 chassis Boxster Spyder. It has the Boxster Spyder top as well as a neat little ducktail spoiler. The brakes might also be bigger, but we can't say for sure.

However, it's testing with a Cayman, and both cars are due for a facelift soon. Also, a closer look at the Boxster reveals that it's wearing the spyder top over a regular Boxster top. Is Porsche trying to trick us, or is an open topped version of the Cayman GT4 coming?